Anthrone is a reagent used for qualitative assays and for the quantitative colorimetric determination of carbohydrates. Numerous assay kits based on Anthrone are available on the market. The Anthrone assay allows the estimation of the total amount of sugars in a given sample. Initially the sample is treated with concentrated sulfuric acid to hydrolyze polysaccharides into monosaccharides and to dehydrate the monosaccharides to a furfuraldehyde derivative. The latter reacts with Anthrone forming a blue-greenish colored complex which can be analyzed by UV spectroscopy. Interestingly, Anthrone can be extracted from some plants, and it is also known for its sweet-smelling characteristics. An early report on the use of Anthrone for sugar determination can be found here: Nature,1952, 626–627.